COMENIUS PROJECT – 4TH ESO 2010 ANSWER THE QUESTIONS ABOUT THE ‘WATER ANALYSIS TASK’
WHAT PUPILS DID THE COMENIUS TASK?
WHAT TEACHERS WERE COORDINATING THE TASK?
WHAT TYPE OF WATER WAS ANNALYSED?
HOW WAS THE TEMPERATURE OF THE WATER MEASURED?
WHAT WAS THE TEMPERATURE?
WHAT ABOUT THE METHOD FOR PH?
THE HARDNESS OF THE WATER WAS….
CONCERNING THE TRANSPARENCY, THE WATER WAS:
WHAT DID THEY ADD TO THE CHLORIDE IONS?
WHAT IS THE NAME OF THE CONTAINER USED TO PUT THE WATER IN?
Then,the teachers designed one multiple choice test for the virtual platform based on a more advanced level of content:
THE TAP WATER ANALYSIS TEST
MULTIPLE CHOICE TEST
Answer the questions about the tap water analysis (only a choice is correct)
1. If the tap water has got a pH of 7.5, it means that …..
□ It is a bit acid □Tap water is always neutral because it is water □ It is slightly basic □ It is a strongly basic
2. We measure pH with the pH meter and the indicator paper …..
□ Both methods are equally precise □ The pH paper must be calibrated in order to work properly □ The pH meter must be calibrated in order to work □ The pH meter needs drying among measurements 3. When the tap water has a lot of bicarbonates …. □ It is pH is acid □ It is always 7 □ It is transparent □ It is slightly basic 4. For a correct measurement of tap water temperature….
□ It is better to use a clinic thermometer because it is very precise □ The measured temperature of the tap water depends on the external temperature □ We must leave the thermometer inside the water for 15 minutes for a precise measurement □ The thermometer precision depends on the minimum temperature that it can measure
5. With reference to the temperature of the tap water …
□ The measured temperature does not depend on the quantity of water which has been taken □ The temperature must be measured as soon as you open the tap □ The temperature depends on the level of chlorides □ pH 7 has got higher temperature than pH 6 6. With reference to hardness of tap water …
□ The tap water boils at 100º no matter its hardness □ It depends on the country's soil where it has been measured □ Hardness has nothing to do with the washing powder consume □ The lower the hardness, the higher the electrical conductivity of the tap water
7. With reference to the transparency measurement of the tap water with laser light …
□ Tap water has got similar transparency to the distilled water □ We use laser light because it spreads better in water compared with the ordinary light □ The water hardness modifies its transparency □ The chloride sparkles of the running tap water can't modify its transparency
8. To determine the chlorides of the tap water through silver nitrate and sodium chromate …
□ Silver nitrate is used to form silver chloride which is soluble □ Silver chromate has got a white colour □ The dissolution of silver nitrate volume is measured with pipette □ The change of colour is produced when we consume the chloride ions and when the silver chromate is formed
Designed by Manuel Veamonte and Begoña Pardo . I.E.S. “Pedro Cerrada”. Utebo (Zaragoza). SPAIN
Commenius Project : “Rich interactive Scientific Learning for Everyone”
ANSWER THE QUESTIONS ABOUT THE ‘WATER ANALYSIS TASK’
Then,the teachers designed one multiple choice test for the virtual platform based on a more advanced level of content:
THE TAP WATER ANALYSIS TEST
MULTIPLE CHOICE TEST
Answer the questions about the tap water analysis
(only a choice is correct)
1. If the tap water has got a pH of 7.5, it means that …..
□ It is a bit acid
□Tap water is always neutral because it is water
□ It is slightly basic
□ It is a strongly basic
2. We measure pH with the pH meter and the indicator paper …..
□ Both methods are equally precise
□ The pH paper must be calibrated in order to work properly
□ The pH meter must be calibrated in order to work
□ The pH meter needs drying among measurements
3. When the tap water has a lot of bicarbonates ….
□ It is pH is acid
□ It is always 7
□ It is transparent
□ It is slightly basic
4. For a correct measurement of tap water temperature….
□ It is better to use a clinic thermometer because it is very precise
□ The measured temperature of the tap water depends on the external temperature
□ We must leave the thermometer inside the water for 15 minutes for a precise measurement
□ The thermometer precision depends on the minimum temperature that it can measure
5. With reference to the temperature of the tap water …
□ The measured temperature does not depend on the quantity of water which has been taken
□ The temperature must be measured as soon as you open the tap
□ The temperature depends on the level of chlorides
□ pH 7 has got higher temperature than pH 6
6. With reference to hardness of tap water …
□ The tap water boils at 100º no matter its hardness
□ It depends on the country's soil where it has been measured
□ Hardness has nothing to do with the washing powder consume
□ The lower the hardness, the higher the electrical conductivity of the tap water
7. With reference to the transparency measurement of the tap water with laser light …
□ Tap water has got similar transparency to the distilled water
□ We use laser light because it spreads better in water compared with the ordinary light
□ The water hardness modifies its transparency
□ The chloride sparkles of the running tap water can't modify its transparency
8. To determine the chlorides of the tap water through silver nitrate and sodium chromate …
□ Silver nitrate is used to form silver chloride which is soluble
□ Silver chromate has got a white colour
□ The dissolution of silver nitrate volume is measured with pipette
□ The change of colour is produced when we consume the chloride ions and when the silver chromate is formed
Designed by Manuel Veamonte and Begoña Pardo . I.E.S. “Pedro Cerrada”. Utebo (Zaragoza). SPAIN
Commenius Project : “Rich interactive Scientific Learning for Everyone”